Hebrews 5:9-11 Amplified Bible (AMP)
9 And having been made perfect [uniquely equipped and prepared as Savior and retaining His integrity amid opposition], He became the source of eternal salvation [an eternal inheritance] to all those who obey Him, 10 being designated by God as High Priest according to the order of [a]Melchizedek.
11 Concerning this we have much to say, and it is hard to explain, since you have become dull and sluggish in [your spiritual] hearing and disinclined to listen.
Hebrews 5:9-11 New International Version (NIV)
9 and, once made perfect, he became the source of eternal salvation for all who obey him 10 and was designated by God to be high priest in the order of Melchizedek.
Warning Against Falling Away
11 We have much to say about this, but it is hard to make it clear to you because you no longer try to understand.